Device for supplying cold water to gas-engine pistons.



F. RBICHBNBAGH. mman FOR SUPPLYING GOLD WATER To GAS ENGINE PIsToNs.

' APPLIUATION PILBD JUNEU., 1908- A 992,986, Patented May 23, 1911.

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FRITZ REICHENBACH, OF GRUNEWALD, NEAR BERLIN, GERMANY.

DEVICE FOR SUPPLYING COLD WATER TO GAS-ENGINE PISTONS.

Specification of Letters Patent.

Patented May 23, 1911.

Application filed June 11, 1908. Serial No. 437,922.

To all 'whom it may concern.'

Be it known that I, FRITZ RmcHENBAcH, a subject of the German Emperor, and resident of Grunewald, near Berlin, Germany, have invented certain new and useful Devices for 'Supplying Cold Water to Gas- Engine Pistons, of which the following is a specification.

The present invention relates to a device for feeding cooling water to the pistons of gas engines in which is utilized in the known manner the accelerating and retarding forces or the forces produced by the in ertia of the moving mass of water. In accordance with the present invention this is done merely by opening differently large cross-sectional inlet and outlet areas of the pipe which serves for the introduction of the water.

The accompanying drawings show two embodiments of the improved device.

Figure l is a longitudinal sectional elevation of one form of the device; and Fig. 2 a like view of a modified form.

In Fig.` 1 the piston a, is shown in the intermediate position. b and c are two pipes which open into the vessels d and e, and are secured to the hollow piston rod. When the piston moves toward the left and reverses its motion and again returns to the intermediate position the inertia of the water causes the water in the piston to pass out toward the left. lVhen the piston reaches the right dead center position and reverses its motion the water passes out toward the right. The same water would therefore always be in the piston and the pison rod and this water would be too warm and could not effect a sufficient cooling. Care must therefore be taken that the water in the piston is always renewed. For that purpose the bottom of the vessel d is horizontal and stepped so as to form two steps ci and cl2. The bottom of the other vessel (e) is horizontal. The distance of the bottom of the vessel e from the end of the pipe is greater than the distance of the bottom d and smaller than the distance of the bottom cl2. The cross-sectional areas are selected in such a manner that the cross-sectional area be- 5 tween the pipeand the step cl is for instance 10 square centimeters and the crosssectional area between the pipe b and the step cl2 is 1000 square centimeters while the cross-sectional area in the right-hand vessel is about 100 square centimeters. Through these 100 square centimeters as much water can pass in as can pass out through the 10 square centimeters of the step cl during the movement of the piston from the left dead center position, when, for instance, the accelerating pressure is very high, say about 9 atmospheres at the end of the pipe c. However, as the accelerating forces do not ordinarily produce such a high pressure the water column does not become split up. When the piston moves from the intermediate position toward the right and back to the intermediate position the water passes out toward the right through the cross-sectional area of 100 square centimeters. Throughout this path the bottom of the Step (Z2 is much deeper so that an inlet cross-sec tional area of 1000 square centimeters is open. Through these 1000 square centimeters as much water can pass in as can pass out on the other side at a high accelerating pressure of approximately 9 atmospheres at the end of pipe b. Also in this case the water column therefore does not become split up. The amounts of water which pass out on the two sides are therefore different and correspond to the crosssectional areas of 100 and 10. At the right ten times as much water therefore passes out as at the left and the right-hand vessel will therefore gradually become filled. In order to prevent over-flow the water may in the known manner be conducted to the lefthand vessel through a pipe and a surface cooler.

In the embodiment shown in Fig. 2 the bottoms of the two vessels (la and e are level. The end of the pipe c which projects into the vessel e is contracted while the pipe b which projects into the vessel (Z3 is provided with a throttle valve f which carries a lever g on its rotary shaft. The end of the lever g is provided with a roller h which engages in a guide-track z' which is formed in such a manner that the throttle valve cuts off the pipe b to a greater or less extent corresponding to the accelerating pressures. The size of the cross-sectional area of the pipe c is smaller than the greatest cross-sectional area and greater than the smallest crosssectional area produced by the throttle valve in the pipe b. The throttle valve may also be arranged in the iston rod per se. The bottoms of the vesse s might also be inclined or stepped when only care is taken that the outlet cross-sectional area is greater for one side than for the other so as to obtain a circulation of the water. On. the reversal of the Vmovement of the piston the inertia and' the accelerating or retarding forces will cause the water in t-he piston to become subjected to great pressures which have a tendency to force the water out of the piston. As the piston has a reciprocatingamovement' the water will alternately pass out of the piston to the right and to the left. The same water will therefore always reenter thepiston and this waterV therefore becomes highly heated which has an unfavorable effect on the operation. Care must therefore be taken that fresh water is always supplied to thepiston. However, in gas engines which run at a( comparatively great speed therinertial' andaccelerating forces are very great and their effect on the water which passes out is greater than the effect of the atmospheric air on the water which isdrawn in by the suction action. The result is that the water column is split up which as commonly known causes showers. However, this must absolutely be prevented and according to the present invention-this is done by checking the outflow of the Vwater and causing less water to be forced out from the piston by the inertia thancan be forcedv in by the atmospheric pressure. For that purpose, referring to the construction shown 1n Fig. 1, the pipe c, which serves for the eX- haust ofthe water from the piston, has a certain cross-sectional outlet area which is smaller than the cross-sectional area of the pipe. The cross-sectional inlet area of the pipe ZJ, through which the water is adapted toenter the piston, is selected in such a mannerV that during the suction actionin the pipe caused by the inertia of the water, which action tends to force the water out of the pipeA c, the cross-sectional'inlet area is greater than thev cross-sectional outlet area of the pipe 0. However, when there is a pressure action in the pipe Z) the cross-sectional inlet area of the pipe Z) must be so small that less water can pass out of the pipe Z) than can enter the pipe c. As therefore the cross-sectional outlet area of the pipe while there is a pressure action in the pipe Z), is smaller thany the cross-sectional out-let area of the pipe c, which always remains the same, it is evident that less water can pass out through the pipe than through the pipe c and that the water therefore must gradually pass from the receptacle Z into the receptacle e and in this manner the desired circulation of the cooling water is obtained.

The piston and piston rods may be charged with water originally in any suitable manner through an opening in either end of the pistonrod. The air in the piston and piston rod will escape through the small open-ended rod y', carried by the piston, one

end thereof extending to the highest point of. the piston, andthe otherv being open to the atmosphere at one end of the rod. It is manifest that. if the source of water is higher than the top of the piston the piston may be readily filled with water. The lower ends lof the rods Z) andv c and b and c are sealed *by the water-in the tanks and the desired amount of water may be maintained in the piston and the rods by sealingv or in any manner closing the outlet end ofthe pipe j.

Having now particularly described and ascertained the nature of my said invention and 1n what manner the same 1s tobe per-- formed L declare what I claim is: v

l. In a device for supplyingA a cooling liquid to a piston by means of` the forces due tothe acceleration and retardation of the reciprocating piston, the combination` with ahollow piston having two hollow piston rods extending` therefrom in opposite directions, two t-anks adapted to contain a cooling liquid, a` pipe connected toleach of said: piston rods, the lowerends of' said pipes extending below the level ofv thecooling liquidin each tank, andmeans wherebyV .and two pipes connected with said' piston-v rods and dipping into the water insaid tanks, the bottoms of said tanks being stepped, whereby the cross-sectional areasof the intake and outlet of the pipes are'changed in consequenceY of the shape ofi the bottoms off the tanks correspondingy to the accelerating-pressuresin such manner that the cross sectional area of the passage duringy the emission period- (CZ) onthe one side/of the piston 1s smaller than the cross-sectional area of the passage during: the admission period (cl2)v on the same side, whereas on the contrary the cross-sectional` areaofi-the passage on the other side remains the same, but its size is between the sizes of' thecross sectional areas of the passagesy on the other side.

3. An apparatus of the class described comprising a hollow piston, a hollow piston` rod extendingY therefrom on each side` of the piston and' in opposite directions,- means` for supplying water to the interior. of said.

piston rods, and meanswhereby a greater quantity of water will be caused to flowinto oneof the piston rods by theK inertiaof the mass of water in the moving piston than will flow into the other piston. rod,`

whereby water will flow in one direction through the piston rods and piston.

4:. A device for supplying cold water to gas engine pistons, the combination with a hollow piston having two hollow piston rods, of means for supplying water to said rods and means for varying the flow of water to one of the piston rods during the reciprocation of the piston, whereby a larger volume of water will flow into one piston rod during a `portion of its movement than will flow into the other piston rod, and the water will move in one direction through the piston rods and piston.

5. In a device for supplying cold water to a gas engine piston the combination of a hollow piston having two hollow piston rods extending therefrom in opposite directions, means for supplying water to said rods during the reciprocation of the pistons means whereby the inertia of the mass of water in the piston and piston rods serves to cause a suction of water into said piston rods, and means for throttling the outlet from one of said rods.

6. In a device for supplying cold water to a gas engine piston the combination of a hollow piston having :two hollow piston rods extending therefrom in opposite directions, means for supplying water to said rods during the reciprocation of the pistons, means whereby the inertia of the mass of water in the piston and piston rods serves to cause a suction of water into said piston rods, and means for throttling the `outlet from one of said rods during a portion of the piston stroke.

7. A device for moving a liquid from one point to another comprising a reciprocating hollow body, two longitudinally extending hollow rods extending in opposite directions from said body, a depending pipe connected to each of said rods, the lower ends of said rods being sealed by the liquid to be moved whereby the inertia of the mass of liquid in the reciprocating body and the rods carried thereby serve to cause a suction of liquid through the pipes into the said hollow rods, and means for throttling the outlet from one of said rods during a portion of the movement of the reciprocating body.

In witness whereof I have hereunto signed my name this 29 day of May 1908, in the presence of two subscribing witnesses.

FRITZ REICHENBACH.

Witnesses WOLDEMAR HAUPT, HENRY HASPER.

Copies of this patent may be obtained :for iive cents each, by addressing the Commissioner of Patents,

Washington, IJ. G. 

